Fluid model

Enabling the fluid solver and specifying fluid model options. The following inputs must be preceded by the given to the fluid solver e.g., “fluid.”

	Description	Type	Default
solve	Specify the names of the fluids or None to disable the fluid solver. The name assigned to the fluid solver is used to specify fluids inputs.	String	None
molecular_weight	Value of constant fluid molecular weight	Real	0
viscosity	Specify which viscosity model to use for fluid [required]. Available options include: ‘constant’ for constant viscosity model	String	None
viscosity.constant	Value of constant fluid viscosity [required if viscosity_model=’constant’].	Real	0
specific_heat	Specify which specific heat model to use for fluid [required if advect_enthalpy]. Available options include: ‘constant’ for constant specific heat model ‘mixture’ required when fluid is a mixture of species	String	None
specific_heat.constant	Value of constant fluid specific heat [required if specific_heat_model=’constant’].	Real	0
thermal_conductivity	Specify which thermal conductivity model to use for fluid [required if advect_enthalpy=1]. available options include: ‘constant’ for constant thermal conductivity model	String	None
thermal_conductivity.constant	Value of constant fluid thermal conductivity [required if thermal_conductivity_model=’constant’].	Real	0
thermodynamic_pressure	Value of the thermodynamic pressure [required if the constraint type is IdealGasClosedSystem]	Real	0
reference_temperature	Value of the reference temperature used for specific enthalpy	Real Real	0 0
species	Specify which species can constitute the fluid phase [defined species must be a subset of the species.solve arguments]	String	None
newton_solver.absolute_tol	Define absolute tolerance for Damped-Newton solver	Real	1.e-8
newton_solver.relative_tol	Define relative tolerance for Damped-Newton solver	Real	1.e-8
newton_solver.max_iterations	Define max number of iterations for Damped-Newton solver	int	500

Below is an example for specifying fluid solver model options.

fluid.solve = my_fluid

fluid.viscosity = constant
fluid.viscosity.constant = 1.8e-5

fluid.reference_temperature = 298.15

fluid.thermal_conductivity = constant
fluid.thermal_conductivity.constant = 0.024

fluid.specific_heat = mixture

fluid.species =  O2  CO  CO2